topic 14 *1

Question 1

order of neurones

Answer 1

sensory (cell body middle), relay,motor

Question 2

negative feedback loop

Answer 2

stimulus (body temp over 37)- sensor (nerve cells in skin,brain)- contro, (temperature regulatory center in brain, hypothalamus)- effector (sweat glands)

Question 3

tropism

Answer 3

response by a plant to stimulus

Question 4

gravitropism

Answer 4

plant response to gravity

Question 5

phototropism

Answer 5

plant response to light either towards or away

Question 6

auxin

Answer 6

plant growth hormone

Question 7

syapses

Answer 7

junction between 2 neurones, allows an impulse to travel from axon terminal to a dendrite of other neurone

Question 8

peripheral nervous system

Answer 8

transmits impulses from cns

Question 9

reflex arc

Answer 9

straight to spinal cord: receptor (in skin)- sensory- relay- (gets info)- motor- effector (muscle or skin)

Question 10

reflex action info travels

Answer 10

in a sensory neurone

Question 11

how do neurones pass from one to another

Answer 11

in axon terminals at the end of neurones contain vesicles which contain neurotransmitters. as an impulse arrives these neurotransmitters are released into synaptic gap and neurotransmitters diffuse across and bind with receptor proteins which are on the dendrite of the next neurone, if enough bind it will trigger an impulse.

Question 12

part of brain which controls homeostasis

Answer 12

hypothalamus

Question 13

name of blood vessels which change during thermoreglationa

Answer 13

arterioles

Question 14

name of system which transmitts hormones

Answer 14

endocrine system

Question 15

rods

Answer 15

sensitive to light

Question 16

cones

Answer 16

red, blue and green, lots found in fovea (where light forms an image)

Question 17

in the eye light goes from

Answer 17

cornea- pupil- lense- optic nerve

Question 18

low light intensity

Answer 18

radial muscles- contract
circular muscles- relax

Question 19

high light intensity

Answer 19

circular muscles- contract
radial muscels- relax

Question 20

light enters the eye when…converging, focusing

Answer 20

light converges behind retina, most focusing happens in cornea

Question 21

near objects

Answer 21

light enters in diverging
ciliary muscles contract
suspensor ligament relaxes
lense thickens
light is refracts stronger (more curved)

Question 22

distant objects

Answer 22

light enters in parallel lines
ciliary muscles relaxes
suspensor ligament tense
lense thins
light is refracts less stronger (less curved)

Question 23

short sighted

Answer 23

cant see far, light refracts too much

Question 24

long sighted

Answer 24

cant see far, light focus beyond fovea